I personally think that Blu-ray could easily be used in the next PlayStation, but obviously they will upgrade the drive. It seems like the first format that could potentially still be viable after one generation. CD was quickly filled up, even DVD is filling up now (Lost Odyssey 4 discs), Blu-ray can go up to at least 100GB already (and 500gb as far as I've heard).

Blu ray is oldtech, and reading speeds will not be a problem if they develop a laser that can actually read these nano particles. And from the confidence they show in this article, i suppose they already have developed a laser for it. It will blow blu ray out of the water.